Sphere, Delphic Expanse
Structures built a millenia ago by the Guardians, a faction within the Temporal Cold War, to slowly convert normal space to the radical laws of physics more hospitable to their species as a prelude to invasion. At least 59 Spheres are identified: typically 19 km in diameter, they are built of a single alloy and stay hidden within a surrounding cloaking field 70,000 km wide. Powered by seven interior fusion reactors some 12 km long, each Sphere emits gravimetric waves that cause spatial anomalies at the points where their emissions intersect. Their interiors are also protected by an intruder alert system. The greater region around these anomalies comes to be called the Delphic Expanse by outsiders, its perimeter defined by destructive thermobaric cloud barriers. Triannon sect leader D'Jamat believes they number in the thousands and are the holy work of the Makers: that the spatial anomalies they create are "Makers' breath," that they should be worshipped, and their purpose is to reshape the Expanse to create a paradise upon the Makers' return. They also believe that to study them is to desecrate them.